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        <a href=".." >3.6 多态多对多</a>
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                                <h1 id="&#x591A;&#x6001;&#x591A;&#x5BF9;&#x591A;">&#x591A;&#x6001;&#x591A;&#x5BF9;&#x591A;</h1>
<p>&#x8FD8;&#x662F;&#x5C31;&#x8FD9;&#x4E4B;&#x524D;&#x6807;&#x7B7E;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x4F46;&#x662F;&#x4E3A;&#x4E86;&#x4E0D;&#x7834;&#x574F;&#x4E4B;&#x524D;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x8FD9;&#x56DE;&#x65B0;&#x5EFA;&#x4E00;&#x4E2A;<code>scopeManyToMany.ts</code>&#x6587;&#x4EF6;&#x3002;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<p>scope &#x91CC;&#x9762;&#x6307;&#x5B9A;&#x7684;&#x503C;&#xFF0C; &#x5C31;&#x662F;&#x5728;&#x8FDE;&#x63A5;&#x8868;&#x521B;&#x5EFA;&#x6570;&#x636E;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4F1A;&#x81EA;&#x52A8;&#x628A;&#x91CC;&#x9762;&#x8BBE;&#x5B9A;&#x597D;&#x7684;&#x5B57;&#x6BB5;&#x586B;&#x5145;&#x597D;&#xFF0C;&#x5E76;&#x4E14;&#x67E5;&#x8BE2;&#x7684;&#x65F6;&#x5019;&#x4F1A;&#x81EA;&#x52A8;&#x628A;&#x8FD9;&#x4E2A;&#x6761;&#x4EF6;&#x5F53;&#x505A; where &#x7684;&#x4E00;&#x9879;&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x6837;&#x6211;&#x4EEC;&#x5C31;&#x80FD;&#x505A;&#x51FA;&#x533A;&#x5206;&#x4E86;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">import</span> Sequelize from <span class="hljs-string">&apos;sequelize&apos;</span>;

<span class="hljs-keyword">const</span> sequelize = <span class="hljs-keyword">new</span> Sequelize(<span class="hljs-string">&apos;nodelover&apos;</span>, <span class="hljs-string">&apos;root&apos;</span>, <span class="hljs-string">&apos;&apos;</span>, {
  host: <span class="hljs-string">&apos;localhost&apos;</span>,
  dialect: <span class="hljs-string">&apos;mysql&apos;</span>,

  pool: {
    max: <span class="hljs-number">5</span>,
    min: <span class="hljs-number">0</span>,
    idle: <span class="hljs-number">10000</span>
  },
});

<span class="hljs-keyword">const</span> Post = sequelize.define(<span class="hljs-string">&apos;Post&apos;</span>, {});

<span class="hljs-keyword">const</span> ItemTag = sequelize.define(<span class="hljs-string">&apos;item_tag&apos;</span>, {
  tag_id: {
    <span class="hljs-keyword">type</span>: Sequelize.INTEGER
  },
  <span class="hljs-keyword">type</span>: {
    <span class="hljs-keyword">type</span>: Sequelize.STRING
  },
  type_id: {
    <span class="hljs-keyword">type</span>: Sequelize.INTEGER
  }
});

<span class="hljs-keyword">const</span> Tag = sequelize.define(<span class="hljs-string">&apos;tag&apos;</span>, {
  name: Sequelize.STRING
});

Post.belongsToMany(Tag, {
  through: {
    model: ItemTag,
    scope: {
      <span class="hljs-keyword">type</span>: <span class="hljs-string">&apos;post&apos;</span>
    }
  },
  foreignKey: <span class="hljs-string">&apos;type_id&apos;</span>,
  constraints: <span class="hljs-literal">false</span>
});

Tag.belongsToMany(Post, {
  through: {
    model: ItemTag,
    scope: {
      <span class="hljs-keyword">type</span>: <span class="hljs-string">&apos;post&apos;</span>
    }
  },
  foreignKey: <span class="hljs-string">&apos;tag_id&apos;</span>,
  constraints: <span class="hljs-literal">false</span>
});


(async () =&gt; {
  await sequelize.sync();
  <span class="hljs-keyword">let</span> post = await Post.create();
  await (post as <span class="hljs-built_in">any</span>).createTag({name: <span class="hljs-string">&apos;&#x6625;&#x98CE;&apos;</span>});

  <span class="hljs-keyword">let</span> tag = await Tag.create({name:<span class="hljs-string">&apos;&#x590F;&#x96E8;&apos;</span>});

  await (tag as <span class="hljs-built_in">any</span>).createPost();
})();
</code></pre>
<p>&#x6311;&#x51FA;&#x4E00;&#x6BB5;&#x4EE3;&#x7801;&#x505A;&#x4E2A;&#x7B80;&#x5355;&#x7684;&#x8BF4;&#x660E;</p>
<pre><code>Tag.belongsToMany(Post, {
  through: {
    model: ItemTag,
    scope: {
      type: &apos;post&apos;
    }
  },
  foreignKey: &apos;tag_id&apos;,
  constraints: false
});
</code></pre><p><strong>&#x4EE5;&#x4E0A;&#x4EE3;&#x7801;&#x9610;&#x8FF0;&#x4E86;&#x4E00;&#x4E0B;&#x5185;&#x5BB9;</strong></p>
<p>Tag &#x4E0E; Post &#x5EFA;&#x7ACB;&#x7684;&#x5173;&#x7CFB;&#x6A21;&#x578B;&#x662F; ItemTag&#xFF0C;&#x6B64;&#x65F6;&#x7684;&#x4E3B;&#x4F53;&#x662F; Tag&#xFF0C;&#x5F53; Tag&#x4F7F;&#x7528; createPost&#x3001;XXXPosts&#x3001;&#x6216;&#x8005;&#x5176;&#x4ED6;&#x65B9;&#x6CD5;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4F1A;&#x81EA;&#x52A8;&#x628A; ItemTag &#x6A21;&#x578B;&#x91CC;&#x9762;&#x7684; type &#x5B57;&#x6BB5;&#x586B;&#x5145;&#x4E3A; <code>Post</code>&#xFF0C;&#x5E76;&#x4E14; ItemTag &#x4E0E; Tag &#x4E4B;&#x95F4;&#x6709;&#x5173;&#x7CFB;&#x7684;&#x5B57;&#x6BB5;&#xFF0C;&#x5E76;&#x4E14;&#x5728; ItemTag &#x6A21;&#x578B;&#x91CC;&#x9762;&#x7684;&#x5B57;&#x6BB5;&#x53EB;&#x505A; Tag_id&#x3002;</p>
<p>&#x8FD0;&#x884C;&#x4EE5;&#x4E0A;&#x4EE3;&#x7801;&#x4E4B;&#x540E;&#xFF0C;&#x4FBF;&#x53EF;&#x4EE5;&#x5728;&#x6570;&#x636E;&#x5E93;&#x4E2D;&#x770B;&#x5230;&#x76F8;&#x5173;&#x7684;&#x6570;&#x636E;&#x3002;</p>

                                
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